package Practice;

import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.SocketException;

public class UDPServer {
    private DatagramSocket socket = null;
    public UDPServer(int port) throws SocketException {
        socket = new DatagramSocket(port);
    }
    public void start() throws IOException {
        System.out.println("服务器启动!");
        DatagramPacket requestPacket = new DatagramPacket(new byte[4096],4096);
        socket.receive(requestPacket);
        String request = new String(requestPacket.getData(),0,requestPacket.getLength());
        String response = process(request);
        DatagramPacket responsePacket = new DatagramPacket(response.getBytes(),requestPacket.getLength(),requestPacket.getSocketAddress());
        socket.send(responsePacket);
        System.out.println();
        System.out.printf("[%s:%d] req=%s resp=%s\n",requestPacket.getSocketAddress(),requestPacket.getPort(),request,response);
    }

    private String process(String request) {
        return request;
    }
}
